JP4648050B2 - Seismic manhole joints and seismic pipe joints - Google Patents

Description

  The present invention relates to a manhole joint and a pipe joint excellent in earthquake resistance.

To connect the sewer pipe and the manhole, one end of the color pipe is buried in the manhole wall, and the sewer pipe is joined to the other end of the color pipe. In many cases, the sewage pipes or manhole walls are destroyed due to the rushing force, making it difficult to restore the sewerage system.
Conventionally, it is known to use an earthquake-resistant manhole joint as shown in FIG.
In FIG. 3, 1 ′ is a manhole, 11 ′ is an invert placed at the bottom of the manhole, 2 ′ is a color pipe having one end embedded in the manhole wall 12 ′, 30 ′ is a color pipe, a water stop ring 41 ′ and sand. A sewer pipe 21 'inserted and joined via a biting prevention ring 42' is a belt-like elastic body adhered to the lower inner half surface of the collar pipe 2 'between the invert end and the end of the sewer pipe with an adhesive 24'. The thickness of the belt-like elastic body 21 'is made substantially equal to the thickness of the sewage pipe 30' so that the flow path surface extending from the invert surface to the bottom surface of the sewage pipe is flush.
In FIG. 3, when a rushing force acts on the sewage pipe 30 ′ during an earthquake, the belt-like elastic body 21 ′ is compressed in the rushing direction, and the rushing force is absorbed by the compression elastic deformation of the elastic body 21 ′, and the sewage pipe 3 ′. And the destruction of the manhole wall 12 'is prevented.

However, in the manhole joint shown in FIG. 3, the belt-like elastic body 21 ′ is adhered to the inner surface of the color tube 2 ′ with an adhesive 24 ′, and after being used for a long time, it is mixed into the sewage and flows down. The elastic body is easily peeled off due to frictional force with sand and the like, degradation of adhesive due to dissolved substances and microorganisms in sewage. Under such peeling of the elastic body, not only the intended earthquake resistance cannot be guaranteed, but the peeled strip-like elastic body hinders the flow of sewage and eventually causes clogging of sewage.
Therefore, in the present applicant, as shown in FIG. 4, a presser plate 22 ′ made of the same material as the sewage pipe 30 ′ is brought into contact with the belt-like elastic body 21 ′, and this presser plate 22 ′ is attached to the collar pipe 2 ′ with an anchor bolt. It has already been proposed to penetrate and fix the belt-like elastic body 21 ′ with 24 ′ (Patent Document 1).
JP 2004-293105 A

In this seismic manhole joint, the thickness of the presser plate 22 'is smaller than the thickness of the sewer pipe 30' of the same material (same elastic modulus), and the elastic modulus of the belt-like elastic body 21 'is smaller than the elastic modulus of the sewer pipe 30'. Therefore, even if the elastic modulus of the composite of the holding plate 22 ′ and the belt-like elastic body 21 ′ is smaller than the elastic modulus of the sewage pipe 30 ′, a rushing force toward the manhole acts on the sewage pipe 30 ′ due to an earthquake or the like. Further, the impact can be sufficiently suppressed by the bending deformation of the composite and the buffering action of the belt-like elastic body 21 'so as to absorb the rushing force, and the manhole 1' and the sewer pipe 30 'can be well prevented from being damaged during an earthquake.
However, in this seismic manhole joint, it is necessary to use a considerably thick anchor bolt 24 ′ so that the anchor bolt 24 ′ can withstand the load acting on the holding plate due to thermal expansion of the sewage pipe 30 ′. Since the head of the anchor bolt 24 ′ protrudes from the surface of the presser plate 22 ′, solid matter in the sewage is likely to get caught, and there is a problem in the scavenging performance.

The object of the present invention is to provide a seismic manhole that can guarantee good scavenging performance over a long period of time and can stably protect the manhole, sewer pipe and the joint between them by absorbing the thrust force into the manhole acting on the sewer pipe during an earthquake. It is to provide a joint.
Another object of the present invention is to provide a seismic pipe joint that can guarantee good scavenging performance over a long period of time and can absorb the intrusion force into the pipe joint that acts on the sewer pipe during an earthquake to stably protect the sewer pipe. There is.

  The seismic manhole joint according to claim 1 has a belt-like elastic body in contact with the inner surface of a collar tube, one end of which is buried in the manhole wall and the other end is inserted and joined to the other end. A presser plate having a holder attached with a fastening member is brought into contact with the belt-like elastic body, and the belt-like elastic body is connected through a fixing bolt between the bolt connection holder and the collar tube. And

  The seismic pipe joint according to claim 2 is a press plate in which a belt-like elastic body is brought into contact with the inner surface of the joint pipe body into which the pipes to be joined are inserted at both ends, and bolt connection holders are attached to the back surface at several locations by fastening members. Is contacted on the belt-like elastic body, and the belt-like elastic body is connected through the fixing bolts between the bolt connection holders and the tube body.

Bolt connection holders are installed at several locations on the back of the presser plate, and each holder is connected to the manhole collar tube or joint tube with fixing bolts. The screws that attach the bolt connection holder to the back of the presser plate The heads of fastening members such as bolts and bolts protrude from the presser plate surface. By using multiple small-sized products as the fastening members, the protruding heads can be made sufficiently small, and solids in sewage Prevents catching and guarantees good scavenging performance.
In addition, the presser plate is thinner than the sewer pipe and can be expected to have a buffering action on the belt-like elastic body against the protrusion of the sewer pipe into the manhole or pipe joint. Can guarantee high earthquake resistance.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1-1 (a) is a drawing showing an embodiment of the seismic manhole joint according to the present invention, FIG. 1-1 (b) is a cross-sectional view of the roll in FIG. 1-1 (b), FIG. -1 (C) is a drawing showing the fixing structure of the presser plate in FIGS. 1-1 (A) and (B).
1-1 (d) is a drawing in which the presser plate shown in (a) and (b) of FIG. 1-1 is developed.

In FIG. 1-1, 1 is a manhole, 11 is an invert formed at the bottom of the manhole by placing concrete. Reference numeral 2 denotes a color tube having one end embedded in the manhole wall 12, and an end e of the invert 11 is positioned slightly above the bottom surface of the color tube. Reference numeral 3 denotes a sewage short pipe, one end of which is inserted and joined to the color pipe 2 via a water stop ring 41 and a sand biting prevention ring 42. Reference numeral 30 denotes a regular sewer pipe joined to the short sewage pipe 31 by a joining pipe. The sewage short pipe 31 is used for addition, and the fixed sewage pipe 30 may be directly joined to the collar pipe. Reference numeral 21 denotes a belt-like elastic body in contact with the lower half portion of the inner peripheral surface portion from the sewer pipe end position to the invert end position in the collar pipe 2. Reference numeral 22 denotes a presser plate which is in contact with the belt-like elastic body 21. The thickness of the presser plate 22 is set so that the surface of the presser plate 22 and the lower inner surface and the invert end of the sewage short pipe 3 are as flush as possible. In addition, the thickness of the belt-like elastic body 21 is set.
The bolt connection holders 23 are screwed from the front surface side of the presser plate 22 at several locations on the back surface of the presser plate 22, in the example shown in the figure, at four locations at equal intervals in the horizontal direction near both ends with the color tube axis direction as the vertical direction. It is attached by fastening fastening members such as bolts.

1-2 (a) (plan view) and (b) (side view) show an example of the bolt connection holder 23, and a corrosion-resistant, high-strength metal plate such as SUS is bent into a hat shape. Holes 231,... (Screw holes or bolt holes) are formed in the arm portion. To attach the bolt connection holder to the back surface of the press plate, the surface of the press plate 22 in FIG. Then, the screw 232 can be screwed into the screw hole 231 of the holder arm part, or the bolt can be inserted into the bolt hole of the arm part from the surface of the holding plate and then tightened with the nut.
1-1 (c), reference numeral 24 denotes a fixing bolt. The fixing bolt 24 is inserted from the outer surface of the collar tube 2 through the belt-like elastic body 21 into the bolt hole 233 in the center of the holder, and the nut 234 is tightened to hold down. A plate 22 is fixed to the color tube 2.
1-1, reference numeral 235 denotes a protective layer provided on the outer surface of the color tube 2, for example, an FRP (fiber reinforced resin) hand layup layer.

In the above, the color pipe 2, the sewage short pipe 3, the sewage pipe 30 and the presser plate 22 can be made of FRP, and the band-like elastic body 21 can be made of foamed rubber such as foamed urethane rubber or foamed silicone rubber. it can.
The belt-like elastic body 21 and the presser plate 22 can be sized in the range of 180 ° to 120 ° below the inner peripheral surface of the color tube, and preferably 180 °.

In order to construct a manhole having the manhole joint shown in FIGS. 1-1A and B, the holding plate 22 and the belt-like elastic body 21 are fixed to the color tube 2 by the bolt connecting holder 23 and the fixing bolt 24. In addition, one end of the color tube 2 can be embedded in the manhole wall 12.
In order to fix the presser plate 22 and the belt-like elastic body 21 to the collar tube 2 with the bolt connecting holder 23 and the fixing bolt 24, as shown in FIG. A bolt connection holder 23 is attached by screwing or insertion fastening of a fastening member 232 such as a screw or bolt from the surface of the presser plate, and a recess and a fixing bolt for accommodating the holder 23 in the belt-like elastic body 21 A hole for inserting the holder 24 is cut, the belt-like elastic body 21 is brought into contact with the inner surface of the color tube 2, the holding plate with the holder is brought into contact with the belt-like elastic body 21, and the fixing bolt 24 is attached to the color tube. 2 is inserted into the bolt hole 233 at the center of the bolt connection holder 23 through the bolt insertion hole of the belt-like elastic body 21, and the nut 234 is tightened. It can be coated with protective layer 235.

According to the seismic joint according to the present invention, in FIG. 1A, the holding plate 22 having the same material as the sewage pipe 30 and the elastic modulus equal to the elastic modulus of the sewage pipe 30 is made thinner than the sewage pipe 30. The elastic modulus of the belt-like elastic body 21 is extremely smaller than the elastic modulus of the sewer pipe 30, and the total thickness of the presser plate 22 and the belt-like elastic body 21 is substantially equal to the thickness of the sewer pipe 30. The elastic modulus of the composite with the belt-like elastic body 21 is smaller than the elastic modulus of the sewer pipe 30, and the longitudinal strain change due to the thrust force toward the manhole of the sewer pipe 30 is a composite of the presser plate 22 and the belt-like elastic body 21. It occurs preferentially towards things. Therefore, if a thrust force toward the manhole is applied to the sewer pipe 30 during an earthquake, the presser plate 22 and the belt-like elastic body 21 are deformed in preference to the sewer pipe 30, and the buffer action of the belt-like elastic body 21 can also be expected. Generation of impact can be sufficiently suppressed to absorb the rushing force well (first stage absorption).
Further, since the presser plate 22 is thinner than the sewage pipe 30, the crushing strength due to the longitudinal force of the presser plate 22 is lower than the crushing strength due to the longitudinal force of the sewage pipe 30. Since the crushing strength at the fixing position by the holder 23 and the fixing bolt 24 is particularly low due to the presence of the holes 231, ..., even if a large thrust force that cannot be absorbed by the first stage absorption is applied, The rushing force can be released by the crushing of the presser plate 22.
Therefore, even if an earthquake occurs, destruction of the sewer pipe 30 and the manhole 1 can be well prevented.

In addition, the fixing bolts 23 are attached to the back surface of the presser plate 22 without directly connecting the fixing bolts to the presser plate 22, and the fixing bolts 24 are connected to the holder 23. The bolt connecting holder 23 is connected to the presser plate 22. A fastening member 232 such as a bolt or a screw that is inserted or screwed in from the surface of the presser plate to be attached to the back surface is used with a plurality of small-sized products and a fixed strength corresponding to the fixing bolt 24. One large sized fastening part head is distributed to a plurality of small sized heads on the surface of the presser plate 22, and sewage solids are caught on the presser plate surface due to protrusions. Can be eliminated well and good scavenging performance can be guaranteed.

(A) in FIG. 2-1 is a longitudinal sectional view showing an embodiment of the earthquake-resistant pipe joint according to the present invention, (b) in FIG. 2-1 is a cross-sectional view in FIG. (C) in FIG. 2-1 is a drawing showing the fixing structure of the presser plate in (A) and (B) in FIG.
FIG. 2A is a developed view of the presser plate in FIG.
FIG. 2-2 is a drawing showing a joint portion of a sewer pipe using a seismic pipe joint according to the present invention.

In FIG. 2A, reference numeral 20 denotes a joint pipe body, and a sewage pipe 30 is inserted and joined to both ends via a water stop ring 41 as shown in FIG. 2B.
In FIG. 2A, reference numeral 21 denotes a belt-like elastic body that is in contact with the lower half portion of the intermediate inner peripheral surface excluding both ends of the joint pipe body 20. Reference numeral 22 denotes a presser plate which is in contact with the belt-like elastic body 21. The thickness of the presser plate 22 and the belt-like elastic body 21 are set so that the surface of the presser plate 22 and the inner surface of the sewer pipe 30 are as flush as possible. The thickness is set.
Bolt connection holders 23 at four locations on the back surface of the presser plate 22, in the illustrated example, at four equally spaced intervals in the horizontal direction near the ends with the tube axis direction as the vertical direction, screws, bolts, etc. It is attached by fastening the fastening member.

  In the bolt connection holder 23, a corrosion-resistant and high-strength metal plate such as SUS shown in FIG. 1-2 is bent into a hat shape, and a plurality of small holes (screw holes or bolt holes) are formed in both arm portions. The bolt insertion hole can be used in the center of the hat, and in order to attach the bolt connection holder 23 to the back surface of the holding plate 22 in FIG. Then, the screw 232 can be screwed into the screw hole 231 of the holder arm portion, or the bolt can be inserted into the bolt hole of the arm portion from the surface of the presser plate and then the nut can be tightened.

  In FIG. 2A, reference numeral 24 denotes a fixing bolt, 234 denotes a fixing nut attached to the center of the inner surface of the joint pipe body 20, and the fixing bolt 24 is elasticated from the central bolt insertion hole 233 of the bolt connection holder 23. The body 21 is inserted through, and the end of the bolt 24 is screwed to the fixing nut 234 to connect the presser plate 22 to the joint pipe body 20.

A metal pipe such as steel or cast iron can be used for the joint pipe body 20, and welding can be used to attach the fixing nut 234 to the joint pipe body 20.
The sewer pipe 30 and the presser plate 22 can be made of FRP, and the belt-like elastic body 21 can be made of foamed rubber such as foamed urethane rubber or foamed silicone rubber.
The band-like elastic body 21 and the presser plate 22 can be sized in the range of 180 ° to 120 ° below the inner peripheral surface of the intermediate portion of the joint tube 20, and preferably 180 °.

  In order to manufacture the above-mentioned seismic pipe joint, in FIG. 2A, bolt connection holders 23 are attached to several places on the back surface of the holding plate 22 by fastening fastening members 232 such as screws and bolts from the holding plate surface. A recess for accommodating the holder 23 and a hole for inserting the fixing bolt 24 are cut into the belt-like elastic body 21, and a fixing nut 234 is attached to the center of the inner surface of the joint pipe body 20 by welding or the like. A belt-like elastic body 21 is brought into contact with the inner surface of the joint tube 20, the holding plate 22 with the holder 23 is brought into contact with the belt-like elastic body 21, and the fixing bolt 24 is inserted into the bolt-like elastic body 21 from the bolt insertion hole 233 in the center of the holder. The bolt 24 can be inserted into the bolt insertion hole, and the tip of the bolt 24 can be fastened to the fixing nut 234 on the inner surface of the joint pipe body.

In order to join the sewer pipes using the seismic pipe joint according to the present invention, as shown in FIG. 2B, the end portions of the two sewer pipes 30 and 30 are connected to the end portions of the pipe joint A, respectively. 41, 41 can be inserted.
According to the pipe joint according to the present invention, in FIG. 2B, the holding plate 22 having the same material as the sewage pipe 30 and the elastic modulus equal to the elastic modulus of the sewage pipe 30 is made thinner than the sewage pipe 30. Is made much smaller than the elastic modulus of the sewer pipe 30, and the total thickness of the presser plate 22 and the belt-like elastic body 21 is substantially equal to the thickness of the sewer pipe 30. And the elastic modulus of the composite is smaller than the elastic modulus of the sewer pipe 30, and the longitudinal strain change due to the thrust force toward the pipe joint of the sewer pipe 30 is directed toward the composite of the presser plate 22 and the belt-like elastic body 21. It occurs with priority. Therefore, when a rushing force toward the pipe joint A acts on the sewer pipe 30 during an earthquake, the presser plate 22 and the belt-like elastic body 21 are deformed in preference to the sewer pipe 30, and the buffer action of the belt-like elastic body 21 can also be expected. Therefore, it is possible to sufficiently suppress the occurrence of impact and absorb the rushing force well (first-stage absorption).
Further, since the presser plate 22 is thinner than the sewage pipe 30, the crushing strength due to the longitudinal force of the presser plate 22 is lower than the crushing strength due to the longitudinal force of the sewage pipe 30. Since the crushing strength at the location where the holder 23 and the fixing bolt 24 are fixed is particularly low due to the presence of the hole (the hole with which the fastening member 232 in FIG. 2-1 is in contact), the first Even if a large thrust force that cannot be absorbed by step absorption is applied, the thrust force can be released by crushing the holding plate at the holder position.
Therefore, even if an earthquake occurs, the destruction of the sewer pipe can be well prevented.

  In addition, as shown in FIG. 2A, a bolt connection holder 23 is attached to the back surface of the presser plate 22 without directly connecting the fixing bolt 24 to the presser plate 22, and the fixing bolt 24 is connected to the holder 23. In order to attach the bolt connection holder 23 to the back surface of the presser plate 22, a fastening member 232 such as a bolt or a screw that is inserted into or screwed into the presser plate surface is used to provide a fixing strength corresponding to the fixing bolt 24. It can be used with a plurality of pieces, and one large-sized fastening part head is distributed to a plurality of small-sized heads on the surface of the presser plate, and because of the protrusions on the surface of the presser plate 22 In addition, it is possible to eliminate the solid matter from the sewage, and to ensure good scavenging performance.

It is drawing which shows the earthquake-resistant manhole joint which concerns on this invention. It is drawing which shows an example of the holder for bolt connection in the earthquake-proof manhole joint which concerns on this invention. It is drawing which shows the earthquake-resistant pipe joint which concerns on this invention. It is drawing which shows the junction part of the pipe | tube which uses the earthquake-resistant pipe joint which concerns on this invention. It is drawing which shows the conventional earthquake-proof manhole joint. It is drawing which shows the conventional seismic manhole joint different from the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manhole 2 Collar pipe | tube 20 Joint pipe body 21 Strip | belt-shaped elastic body 22 Presser plate 23 Bolt connection holder 24 Fixing bolt

Claims (2)

A presser plate with a belt-like elastic body in contact with the inner surface of a color tube with one end buried in the manhole wall and the sewage pipe inserted and joined to the other end. A seismic manhole joint, wherein the belt-like elastic body is in contact with the belt-like elastic body, and the bolt-shaped holder and the collar tube are connected through the belt-like elastic body with fixing bolts. A belt-like elastic body is brought into contact with the inner surface of the joint pipe body into which the pipes to be joined are inserted at both ends, and a presser plate having bolt connection holders attached to the back surface at several places on the belt-like elastic body is brought into contact with the belt-like elastic body. An earthquake-resistant pipe joint characterized in that each of the bolt connection holders and the pipe body are connected through a belt-like elastic body with a fixing bolt.

Images